-6.89% is the change from 827 to 770
Calculation steps:
[( 770 - 827 ) ÷ 827] x 100 = -6.89%
Formula
Percentage change = [(770 - 827) / 827] x 100
Subtract the new number by the original number
770 - 827 = -57
-57 ÷ 827 = -0.06892382103990327
-0.06892382103990327 x 100 = -6.89%